title: Quantitative isolation of oligo- and polyadenosine-diphosphoribosylated proteins by affinity chromatography from livers of normal and dimethylnitrosamine-treated Syrian hamsters. In vivo and in vitro metabolism of the homopolymer.
abstract: Polyadenosine- and adenosine-diphosphoribosylated proteins of hamster liver were quantitatively isolated with the aid of m-aminophenyl boronic acid glutaryl hydrazide polyacrylamide affinity resin by selective adsorption at pH 8.2 and elution at pH 4.0. Polymer-free proteins, DNA, and RNA are readily separated from adenosine-diphosphoribosylated proteins. The total quantity of proteins that is covalently modified by the homopolymer is 14.3 micrograms/mg of DNA or 37.4 micrograms/g of liver in controls and 38.7 micrograms/mg of DNA or 116 micrograms/g of liver in dimethylnitrosamine-treated hamsters. Polymer content increases from 9 to 15 nmol/mg of DNA to 42 to 118 nmol/mg of DNA following treatment with dimethylnitrosamine. Pulse labeling with [14C]ribose results in a parallel doubling in dimethylnitrosamine-treated animals of the specific activities of adenosine- diphosphoribose and NAD+ and of the [14C]ribose content of polyadenosine-diphosphoribose of chain length between 20 and 40, indicating chain elongation of pre-existing larger polymers. Two groups of proteins that are isolated as polyadenosine-diphosphoribose adducts are increased significantly after treatment with dimethylnitrosamine, one minor component of a mass between 100-112 X 10(3) daltons, and a major group exhibiting a mass of 158-162 X 10(3) daltons. Polyadenosine-diphosphoribose synthetase activity of isolated hepatic nuclei is increased by 32-37% after dimethylnitrosamine treatment, and since the change in glycohydrolase activity is negligible relative to the increase in synthetase, the augmentation of polyadenosine-diphosphoribosylated proteins can be explained by the increased synthetase of nuclei. The molecular size distribution of DNA in liver nuclei of control and dimethylnitrosamine-treated hamsters is indistinguishable.
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000302:isolation & purification / Q000378:metabolism*; D000249:Adenosine Monophosphate / Q000302:isolation & purification; D000818:Animals; D002467:Cell Nucleus / Q000187:drug effects / Q000201:enzymology; D002850:Chromatography, Gel; D006224:Cricetinae; D004128:Dimethylnitrosamine / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008647:Mesocricetus; D008970:Molecular Weight; D009702:Nucleoside Diphosphate Sugars / Q000378:metabolism*; D011061:Poly A / Q000378:metabolism*; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D011506:Proteins / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D009702:Nucleoside Diphosphate Sugars; D011506:Proteins; D000246:Adenosine Diphosphate Ribose; D011061:Poly A; D000249:Adenosine Monophosphate; D011065:Poly(ADP-ribose) Polymerases; D004128:Dimethylnitrosamine